HVAC Mold Prevention: A Dallas Guide

Why Dallas HVAC Systems Grow Mold

Air conditioning coils condense water year-round in North Texas. Combined with airborne spores, dust, and warm indoor temperatures, this creates ideal conditions for Cladosporium, Penicillium, and Aspergillus growth inside the evaporator coil and drain pan.

Symptoms include musty odors from vents, worsening allergies, headaches, and visible dark spots around registers.

5 Prevention Strategies

1) Keep drain pans clear — clogged drains create standing water. 2) Install UV-C lights in the air handler to sterilize the coil surface. 3) Use MERV 11 or higher filters and replace every 60–90 days. 4) Maintain indoor humidity between 30% and 50%. 5) Schedule annual coil and duct cleaning.